| Dependency injection of fields [message #897075] |
Sat, 21 July 2012 13:18  |
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Hi to anyone,
I have a Part and want to use dependency injection for inject some fields:
public class PreviewEditorPart {
@Inject
private PreviewEditorContent previewEditorContent
}
But somehow this is null if I want to do something in constructor.
If I add this to constructor and do a this.previewEditorContent = ...
it works, but I don't want to change signature.
Do I have another possibility to inject this?
Why isn't my field injected although I have a @Inject?
The constructor contains a reference to the mother - composite. Do I get this somehow by injection to avoid the necessary of having a constructor other than the default-constructor
Thank you for your help
Best regards
Markus
[Updated on: Sat, 21 July 2012 13:20] Report message to a moderator |
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| Re: Dependency injection of fields [message #897085 is a reply to message #897075] |
Sat, 21 July 2012 14:39  |
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Field injections are performed only after the object is fully created, which is after the constructor returns.
You can either do the injection as a parameter of the constructor or create another method and annotate it with @PostConstruct. This annotated method will be called by the framework right after the constructor returns AND the injector has performed all field injections. Also this method is called only once in the object lifecycle.
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